- The definition phase has started on June 1th 2010.
- The Commitment phase has started on June 14th 2010.
- The private beta phase has started on July 22th 2010.
And because that time the private betas last for only one week, probably the public beta started on July 29th 2010.
If you take a look to the oldest questions, you'll see that some of them have been asked even before July 22th 2010. like this one which has been asked on August 9th 2009 and has been migrated from stackoverflow.com to GIS.SE.
Also if you cast a glance to questions asked before July 29th 2011, you'll see that some of them has been migrated from another sites like superuser.com, etc.
I wanna see if you're going to migrate some questions from other sites to here in private beta?
Or it should be done after getting assured that private beta has ended successfully?
And how will the migration take place?